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markrohr's Main System
Last Update: October 16, 2006 at 10:19:30 IP Address:
Amplifier: Adcom GFA-5300, pooged.

Home-built all-discrete SS headphone amp with overkill power supply.

AMC 3020 integrated for rear channels.

Preamplifier (or None if Integrated): Home-built all-discrete SS. Design stolen from a Harman Kardon schematic but implemented with very high quality parts.
Speakers: Home-built medium-size two-way sealed-box speakers, bi-wired. Birch ply cabs, Vifa PL18WO-09-08 6-1/2' paper-cone woofs, Scan-Speak D2905/9500 1' cloth-dome tweets. 1st-order crossover using Hovland MusicCaps and Solen 14g Perfect Lay inductors. Zobel network. Slightly over-damped bass, Q = about .63

Sub: Parts Express Dayton 10' Titanic.

Surround speakers: RA Labs Mini-Reference (2-way sealed box, 6-1/2' woofs). Tweeters replaced with 1' Vifa silk-domes, crossovers reworked to suit.

CD Player/DAC: Rotel RCD-971, output stage and PS lightly pooged.
Turntable/Phono Stage: AR EB-101 w/stock arm

Shure V15 Vx MR.

Other Source(s): Magnum-Dynalab FT11 with modified PS and output stage.

Pioneer PDR-609 CD recorder

Pioneer RT-701 R-to-R

Sony ES-series TC-KA1ESA 3-head cassette deck

Other Accessories/Room/Misc.:
Speaker Cables/Interconnects: Speaker cables: Nordost CinemaFlex in star-quad configuration, two identical bi-wire sets.

ICs: Jon Risch DIY twisted-pair-with-shield, Harmonic Technology Precision Link, Monster 850i.

Other (Power Conditioner, Racks etc.): Home-built music surround box: basically a line-level L-R extractor built with premium parts. Very effective with simply-miked recordings. Rear channels are run at a level that is imperceptible unless switched off.

APS-8 FM antenna on rotor in attic, RG6-QS downlead.

ACI 65Hz first-order high-pass filters in front of power amp.

Monster HTS-2000 power filter

Jensen Iso-Max isolation transformer between video and audio to resolve ground-loop issue.

Speaker Stands: poured-concrete birdbath columns. Speakers fixed with Blu-Tak ($1.79 variety).

Rack: custom-made of veneered 3/4' birch plywood, heavily braced. Five shelves, each wide enough for two components. Weight: approx. 1 ton.

Grado SR-60 and SR-125 headphones

Four Audio Asylum Yo-Yos, strategically placed. (The blue ones sound better.)

Tweaks: DIY isolation via unhappy balls under CDP, TT, and tuner, DIY roller bearings, vibrapods, cones, and other footers sprinkled about freely.

Room Comments/Treatments: Too small and too square.
Music Preferences and Comments:
Music Used (Genre/Selections): Classical, Jazz, Blues, Rock, actually darn near anything except rap.
System Goals/Comments: Natural sounding instruments, good bass, detail without etched treble.
System Strengths: Tone: the system gives a plausible version of the sound of instruments. Relatively smooth bass. Non-fatiguing treble, a smidge rolled-off at the top. The Haffler-type surround gives it a spaciousness that is attractive.
System Weaknesses: Both system and room are too small to do justice to a symphony orchestra in full cry. Not the most dynamic system I've ever heard, nor the most holographic.

Lacks polarity switch; I switch at the speaker terminals using banana plugs.

Video/HT System: None
Other Interests/Hobbies/Occupation: classical bass trombone player; low-brass teacher; I also write program notes for symphony orchestras and other clients. Photography (black + white infrared landscapes, mostly)--not enough time for printing these days, must find some.

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